Drill bit



Nov. 17, 1,561,580

G. R. WATSON DRILL B IT Filed June 19. 1924 V I 6 I I \V/ //I' r \1 w II. I 5 l 'l' 1U 19 1 I I, I

Inventor.

Watson, 65/

A orne y.

Patented Nov. 17, 1925,

UNITED STATEd PATENT OFFICE.

GEORGE E. WATSON, 0F WATERLOO, IOVIA, ASSIGNOR TO ARMSTRONG MANUFACTUR-ING COMPANY, OF W'ATE RLOO, IOWA.

DRILL BIT.

Application filed June 19, 1924, Serial No. 720,975.

To all "whom it may concern.

Be it known that I, Gnonen R. Carson, a citizen of the United States ofAmerica, and a resident of lVaterloo, Black Hawk County, Iowa, haveinvented certain new and useful Improvements in Drill Bits, of which thefollowing is a specification.

My invention relates to improvements in drill-bits, and the object of myimprovement is to supply a bit for a drill such as is used in drillingwells through rock strata, which shall have such a cinnbination ofcrushing means and cutting means as will cooperate most el'liciently andrapidly in the work of drilling.

This object I have accomplished by the means which are hereinafterdescribed and claimed, and which are illustrated in the ac companyingdrawings, in which Fig. i is in side elevation of a drill having myimproved bit, with part of the drill body broken away, and Fig. 2 is anelevation of the same taken at an angle of ninety degrees to theelevation shown in said Fig. 1. Fig. 3 is a plan of the bit face.

The shank 1 of the drill has a coned and exteriorly threaded boss 2 forintermeshing with a threaded socket in a drill-stem. The body 3 of thedrill is of octangular shape in c; section with two opposite facesprovided with longitudinal grooves 4 starting from said said shank l andextending down wardly to open through the flat crushing end-face of thebit, the bit-end 5 being of larger diameter than the shank and body ofthe drill, with cylindrical outer wall having the opposite clefts 9which are considerably narrower than the grooves a.

The lower en de of the grooves l terminate above the irushing face 5 andthe cylindrical wall, thei above in a concave or arcuate anticlinaldiametrical ridge TS, whereby the crushing face of the bit is dividedinto like somewhat crescental halves 5 in the same transverse plane withthe middle interspa-ce wider than said side clefts or openings 9. Alineddiametrically with the arcuate ridge T8 but below it at either side andextending across the crushing faces 5 are like straight anticlinalcutter ridges 10 having a rather wide angle, The inner ends of theseridges 0 m be n l e as a As the cutter ridges 10 project downwardly fromthe flat crushing faces they chop up the rock at the bottom of thedrill-hole as the drill rises and is dropped and then the crushing faces5 crush and reduce to powder the detached fragments of rock mostellicicntly as none can. escape in any way or direction, because thewidened end of the bit nearly fits the bore of the drill-hole. As thepart 5 has a cylindrical outer wall which interrupted on opposite sidesonly by the relativelynarrow clefts 9, the edges of the latter may reamout the hole cylindrically, the clefts not being wide enough to stall orshape flat places in the wall of the hole. The side grooves 4; are ofample size to hold and convey sufficient water to the bottom of the hereabout the bit, while the arcuate cutter 7-8 breaks up the rocky cone allthe time forming in the bottom of the drill-hole.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is:

l. A drill-bit having a flat crushingface, and having side groovesterminating above said crushing-face in an arcuate anticlinal ridge, andsaid crushing-face having anticlinal ridges extending across it.

2. A drillbit having a flat crushing-face and a pair of ridges thereonin diametrical alinement with their inner ends spaced apart, thecrushing-face having an opening extending diametrically across it andseparating said ridges medially and transversely to providethereloetween a concave anticlinal cutter.

3. A drill-loit whose body is terminally widened to provide a like pairof substantially crescental reamers with a fiat crushing face, whoseinterspace is bridged by a din" metrically positioned upwardly arcuateantiolinal ridge, said body having 011 opposite sides longitudinalgrooves terminating below at said arcuate ridge, with the endinterspaces of the crescental parts narrower than said grooves toprevent the drill from form ing flat spots in the wall of a dr1ll-hole.

Signed at "Waterloo, Iowa, this 15th day of May, 1924.

GEORGE E. WATSON,

